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A163793
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a(n) is the n-th J_13-prime (Josephus_13 prime) Place the numbers 1..N (N>=2) on a circle and cyclicly mark the 13th unmarked number until all N umbers are marked. The order in which the N numbers are marked defines a permutation; N is a J_13-prime if this permutation consists of a single cycle of length N.
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2
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5, 57, 117, 187, 251, 273, 275, 665, 2511, 40393, 48615, 755921, 970037
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